RT9229 Advanced Dual PWM and Dual Linear Power Controller General Description Features The RT9229 is a 4-in-one power controller optimized z 4-in-one Regulated Voltages for Microprocessor Core, I/O, Clock, and GTL for high-performance microprocessor and computer applications. The IC integrates two PWM controllers, z Compatible with HIP6019B a linear regulator and a linear controller as well as z Power-Good Output Voltage Monitor monitoring and protection functions into a 28-pin Switching section SOP package. The first PWM controller regulates the z microprocessor core voltage with a synchronous z buck converter, while the second PWM controller z ±1% DAC Accuracy Fast Transient Response supplies the 3.3V power with a standard buck z Full 0% to 100% Duty Cycle Driver converter. The linear regulator provides power for the z Fixed 200kHz Switching Frequency clock driver circuit and the linear controller regulates z Adaptive Non-overlapping Gate Driver power for the GTL bus. z Over-current Monitor Uses MOSFET RDS(ON) z Over-voltage Protection Uses Lower MOSFET The RT9229 features an Intel-compatible, TTL 5-bit programmable DAC that adjusts the core voltage 5-bit DAC Programmable from 1.3V to 3.5V Linear Section from 2.1V to 3.5V in 0.1V increments and from 1.3V z User-adjustable Linear Regulator Output Voltage to 2.05V in 0.05V steps. The second PWM controller z MOSFET or NPN Driving Capability is user-adjustable for output level between 3.0V and z Ultra Fast Response Speed 3.5V with ±2.5% accuracy. The 5-bit DAC has a z Under-voltage Protection typical ±1% tolerance. The linear regulator uses an z Internal Thermal Shutdown internal drive device to provide 2.5V ±2.5% output voltage. The linear controller drives an external N- Applications channel MOSFET or a low cost NPN bipolar z Full Motherboard Power Regulation for Computer transistor to provide 1.5V ±2.5%. z Low-voltage Distributed Power Supplies The RT9229 monitors all the output voltages. A Pin Configurations Power-good signal is issued when the core voltage is Part Number within ±10% of the DAC setting and the other levels RT9229CS are above their under-voltage levels. Additional buildin over-voltage protection for the core output uses the lower MOSFET to prevent output voltage above 115% of the DAC setting. The PWM over-current function monitors the output current using the voltage drop across the upper MOSFET’s RDS(ON) which eliminates the need for a current sensing resistor. Ordering Information RT9229 Package type (Plastic SOP-28) Pin Configurations TOP VIEW UGATE2 PHASE2 1 28 2 27 VID4 VID3 VID2 VID1 VID0 PGOOD OCSET2 3 26 4 5 25 6 23 7 22 8 21 9 20 FB2 10 NC2 11 SS 12 19 FAULT 13 FB4 14 24 VCC UGATE1 PHASE1 LGATE1 PGND OCSET1 VSEN1 FB1 NC1 FB3 GATE3 17 GND 16 VOUT4 18 15 VSEN2 S : SOP-28 Operating temperature range C: Commercial standard DS9229-03 July 2001 www.richtek-ic.com.tw 1 RT9229 Absolute Maximum Ratings z Supply Voltage +15V z PGOOD, FAULT and GATE Voltage GND−0.3V to VCC+0.3V z Input, Output or I/O Voltage GND−0.3V to 7V z Ambient Temperature Range 0°C to +70°C z Junction Temperature Range 0°C to +125°C z Storage Temperature Range −65°C to +150°C z Lead Temperature (Soldering, 10 sec.) 300°C z Package Thermal Resistance SOP-28, θJA 60°C/W Recommended Operating Conditions z Supply Voltage +12V ±10% z Ambient Temperature Range 0°C to 70°C z Junction Temperature Range 0°C to 125°C CAUTION: Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Electrical Characteristics (VCC = 12V, PGND = 0V, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units -- 10 -- mA VCC Supply Current Nominal Supply Current ICC UGATE1, GATE2, GATE3, LGATE1, and VOUT4 Open Power-on Reset VCC Rising Threshold VOCSET = 4.5V 7.5 -- 9.5 V VCC Falling Threshold VOCSET = 4.5V 7 -- 9 V -- 1.25 -- V DAC (VID0 – VID4) Input Low Voltage -- -- 0.8 V DAC (VID0 – VID4) Input High Voltage 2.0 -- -- V Rising VOCSET1 (and 2) Threshold Reference and DAC DACOUT Voltage Accuracy DACOUT = 2.05 ~ 3.50V -1 -- 1 % DACOUT Voltage Accuracy DACOUT = 1.30 ~ 2.00V -1% -- 20mV -- 1.240 1.265 1.290 V Reference Voltage (Pin FB2 and FB3) VREF To be continued www.richtek-ic.com.tw 2 DS9229-03 July 2001 RT9229 Parameter Symbol Test Conditions Min Typ Max Units 180 200 225 kHz -- 1.9 -- VP-P -2.5 -- 2.5 % -- 75 87 % -- 100 -- mV 180 230 -- mA -- 700 -- mA -2.5 -- 2.5 % -- 75 87 % -- 100 -- mV 20 40 -- mA -- 65 -- dB Oscillator Free Running Frequency Ramp Amplitude ∆VOSC Linear Regulator Regulation 10mA < IVOUT2 < 150mA Under-voltage Level FB4 Rising Under-voltage Hysteresis Over-current Protection IOVP Over-current Protection During Startup Linear Controller Regulation VSEN3 = GATE3 0 < IGATE3 < 20mA Under-voltage Level FB3 Rising Under-voltage Hysteresis VIN2 – VOUT3 > 1.5V Output Drive Current PWM Controller Error Amplifier DC Gain PWM Controller Gate Driver UGATE 1 (and 2) Source RUGATE VCC = 12V VCC - VUGATE = 1V -- 3 7 Ω UGATE 1 (and 2) Sink RUGATE VUGATE = 1V -- 3 7 Ω LGATE Source ILGATE1 VCC = 12V, VLGATE1 = 2V -- 1 -- A LGATE Sink RLGATE1 VLGATE1 = 1V -- 2 6 Ω Protection VOUT1 Over-voltage Trip VSEN1 Rising 112 115 118 % VOUT2 Over-voltage Trip VSEN2 Rising 4.1 4.3 4.5 V FAULT Souring Current VFAULT = 8V 10 14 -- mA 170 200 230 µA -- 11 -- µA OCSET1 (and 2) Current Source IOCSET VOCSET = 4.5VDC Soft-start Current ISS VSS = 1V Power Good VOUT1 Upper Threshold VSEN1 Rising 108 -- 112 % VOUT1 Under Voltage VSEN1 Rising 90 -- 94 % VOUT1 Hysteresis (VSEN1/DACOUT) Upper/Lower Threshold -- 2 -- % -- -- 0.5 V PGOOD Voltage Low DS9229-03 July 2001 VPGOOD IPGOOD = -4mA www.richtek-ic.com.tw 3 RT9229 Function Block Diagram OCSET2 + 200µA LUV + 115% 200µA _ VCC _ OC UGATE2 + PHASE2 OC2 _ + _ ERROR AMP1 _ ERROR AMP2 PWM COMP1 _ 2.5V VCC _ + OSCILLATOR GATE CONTROL LOGIC VCC LOWER DRIVE SS LGATE1 PGND GND TTL D/A CONVERTER (DAC) COMPENSATION 5V FAULT www.richtek-ic.com.tw DACOUT 11µA 4.3V 4 PWM1 + VSEN2 PHASE1 INHIBIT + 1.26V _ PWM COMP2 + FB2 OC1 + COMPENSATION 0V SOFT-START & FAULT LOGIC INHIBIT GATE PWM2 CONTROL _ PGOOD UGATE1 UPPER DRIVE + OC4 _ 0.25V FB4 VCC + + VOUT2 90% _ + + 1.26V _ POWER-ON RESET (POR) 110% _ VSEN2 VCC + + 0.3V _ _ GATE3 LINEAR UNDER VOLTAGE OCSET1 _ FB3 VSEN1 FB1 VID0 VID2 VID4 VID1 VID3 DS9229-03 July 2001 RT9229 Functional Pin Description UGATE1, UGATE2 (Pins 27 and 1) An over-current trip cycles the soft-start function. Connect UGATE pins to the respective PWM Sustaining an over-current for 2 soft-start intervals converter’s upper MOSFET gate. This pin provides shuts down the controller. the gate drive for the upper MOSFETs. SS (Pin 12) PHASE1, PHASE2 (Pins 26 and 2) Connect a capacitor from this pin to ground. This Connect the PHASE pins to the PWM converter’s capacitor, along with an internal 11µA (VSS>1V) upper MOSFET source. These pins are used to current source, sets the soft-start interval of the monitor the voltage drop across the upper MOSFETs converter. for over-current protection. VID0, VID1, VID2, VID3, VID4 (Pin 7, 6, 5, 4, and 3) Pulling this pin low with an open drain signal will shut down the IC. VID0~4 are the input pins to the 5-bit DAC. The FAULT (Pin 13) states of these five pins program the internal voltage This pin is low during normal operation, but it is reference, DACOUT. The level of DACOUT sets the pulled to about 8V (VCC = 12V) in the event of an over-voltage or over-current condition. core converter output voltage (VOUT1). It also sets the core PGOOD and OVP thresholds. Table 1 specifies the DACOUT voltage of 32 combinations of FB4 (Pin 14) VID levels. Connect this pin to a resistor divider to set the linear regulator output. PGOOD (Pin 8) PGOOD is an open collector output used to indicate VSEN1, VSEN2 (Pins 22 and 15) the status of the PWM converter output voltage. This These pins are connected to the PWM converters’ pin is pulled low when the core output is not within output voltage. The PGOOD and OVP comparator ±10% of the DACOUT reference voltage, or when circuits use these signals to report output voltage any of the other outputs are below their under- status and for over-voltage protection. VSEN2 voltage thresholds. The PGOOD output is open for provides the input power to the integrated linear ‘11111’VID code. See table 1. regulator. FB1, FB2 (21 and 10) FB1, 2 are the available external pins of the PWM error amplifiers. Both the FB pins are the inverting input of the error amplifiers. OCSET1, OCSET2 (Pins 23 and 9) Connect a resistor (ROCSET) from this pin to the drain of the upper MOSFET. ROCSET, an internal 200µA current source (IOCSET), and the upper MOSFET onresistance (RDS(ON)) set the converter over-current (OC) trip point according to the following equation: IPEAK = IOCSET×ROCSET RDS(ON) DS9229-03 July 2001 www.richtek-ic.com.tw 5 RT9229 VOUT4 (Pin 16) Output of the linear regulator. Supplies current up to 230mA. GATE3 (Pin 18) Connect this pin to the gate of an external MOSFET or the base of a NPN. This pin provides the drive for the linear controller’s pass transistor. FB3 (Pin 19) Connect this pin to a resistor divider to set the linear controller output voltage. PGND (Pin 24) This is the power ground of UGATE1, LGATE1, and UGATE2. Tie the synchronous PWM converter’s lower MOSFET source to this pin. LGATE1 (Pin 25) Connect LGATE1 to the synchronous PWM converter’s lower MOSFET gate. This pin provides the gate drive for the lower MOSFET. VCC (Pin 28) Provide a 12V bias supply for the IC to this pin. This pin also provides the gate bias charge for all the MOSFETs controlled by the IC. www.richtek-ic.com.tw 6 DS9229-03 July 2001 RT9229 Table 1. VOUT1 Voltage Program Pin Name Normal OUT1 Voltage VID4 VID3 VID2 VID1 VID0 DACOUT 0 1 1 1 1 1.30 0 1 1 1 0 1.35 0 1 1 0 1 1.40 0 1 1 0 0 1.45 0 1 0 1 1 1.50 0 1 0 1 0 1.55 0 1 0 0 1 1.60 0 1 0 0 0 1.65 0 0 1 1 1 1.70 0 0 1 1 0 1.75 0 0 1 0 1 1.80 0 0 1 0 0 1.85 0 0 0 1 1 1.90 0 0 0 1 0 1.95 0 0 0 0 1 2.00 0 0 0 0 0 2.05 1 1 1 1 1 INHIBIT 1 1 1 1 0 2.10 1 1 1 0 1 2.20 1 1 1 0 0 2.30 1 1 0 1 1 2.40 1 1 0 1 0 2.50 1 1 0 0 1 2.60 1 1 0 0 0 2.70 1 0 1 1 1 2.80 1 0 1 1 0 2.90 1 0 1 0 1 3.00 1 0 1 0 0 3.10 1 0 0 1 1 3.30 1 0 0 1 0 3.30 1 0 0 0 1 3.40 1 0 0 0 0 3.50 DS9229-03 July 2001 www.richtek-ic.com.tw 7 RT9229 Typical Application Circuit 12V R12 10 L1 F1 5V 1µH C1-4 4x1000µF 30A GND + C5-6 2x1µF C9 C7 1µF 1000pF R1 28 9 1.21k Q3 HUF76137S3S L2 VOUT2 3.3V 1 2 + 5.2µH C18-21 4x1000µF R3 4.99K C22 0.68µF 23 VCC OCSET2 OCSET1 UGATE2 PGOOD PHASE2 UGATE1 RT9229 15 VSEN2 10 3.32K R6 VOUT3 GTL = 1.5V FB2 VSEN1 VOUT4 2.5V + C23 1000µF R10 + C24 270µF www.richtek-ic.com.tw 8 187 1K 19 R9 1K 1.21k POWERGOOD 8 27 Q1 HUF76139S2S 25 24 Q2 HUF76139S2S GATE3 FB3 16 VOUT4 14 FB4 R11 FAULT 1K 13 GND 17 2.9µH VOUT1 1.3 to 3.5V + R4 4.99K C10-16 7x1000µF C17 R7 0.68µF 732K VID0 7 6 VID1 VID2 5 4 VID3 3 VID4 SS R13 4.99K L3 22 FB1 21 18 R8 LGATE1 PGND 5.11K Q4 HUF75307D3S 1000pF R2 PHASE1 26 D1 MBR2535CTL R5 C8 12 C25 0.039µF DS9229-03 July 2001 RT9229 Package Information H M B B J A C F Symbol DS9229-03 July 2001 D I Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 17.704 18.110 0.697 0.713 B 7.391 7.595 0.291 0.299 C 2.362 2.642 0.093 0.104 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.229 0.330 0.009 0.013 I 0.102 0.305 0.004 0.012 J 10.008 10.643 0.394 0.419 M 0.381 1.270 0.015 0.050 www.richtek-ic.com.tw 9 RT9229 RICHTEK TECHNOLOGY CORP. RICHTEK TECHNOLOGY CORP. Headquarter Taipei Office (Marketing) 6F, No. 35, Hsintai Road, Chupei City 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 Tel: (8862)89191466 Fax: (8862)89191465 Email: [email protected] www.richtek-ic.com.tw 10 DS9229-03 July 2001